Portable shade structure



FIG. 1 is a perspective view of a portable shade structure in accordance with my design;

FIG. 2 is a top plan view;

FIG. 3 is a bottom plan view;

FIG. 4 is a right side elevation, of which the left side elevation is a mirror image;

FIG. 5 is a front elevation; and,

FIG. 6 is a rear elevation view. 

The ornamental design for a portable shade structure, as shown and described. 